SuperPro SPF3507XK Front Upper Control Arm Inner Caster Bush Kit for Lexus IS/GS

Vehicle Fitment

• 2006-2013 Lexus IS250 (RWD only)
• 2006-2012 Lexus IS350 (RWD only)
• 2008-2014 Lexus IS F (RWD only)
• 2006-2011 Lexus GS300 (RWD only)
• 2007-2012 Lexus GS350 (RWD only)

Fitment Notes

• RWD models only - this bushing does not fit AWD (Lexus "x" designated) variants of the IS or GS
• Front, upper control arm, inner position - double offset design for caster correction
• Confirm your specific model year against SuperPro's fitment lookup, as this generation of IS/GS spans several sub-model years with minor suspension variations

Features

• Double-offset bushing design delivers additional positive caster to both sides of the vehicle
• Improves directional stability, steering crispness, and return-to-center feel
• Non-tire-wearing geometry adjustment - corrects caster without the tire wear penalty of a camber-only change
• Restores precise alignment lost to worn factory rubber bushings
• Knurled bushing surfaces retain grease longer, reducing ongoing maintenance
• Engineered to minimize added NVH (noise, vibration, harshness) compared to lower-quality polyurethane bushings
• Suitable for street and performance driving applications
• Backed by SuperPro's lifetime warranty

Specifications

• Fitting Position: Front, Upper Control Arm - Inner
• Bushing Material: Polyurethane
• Bushing Type: Double Offset (Eccentric)
• Alignment Function: Camber/Caster Adjustable
• Drivetrain Compatibility: RWD only
• Warranty: Lifetime

Included Components

• 4x Polyurethane Bushings
• Tubes and Sleeves

Product Description

The inner mounting point on the front upper control arm plays a central role in how a rear-drive Lexus IS or GS holds its alignment through hard cornering and braking. As the factory rubber bushing here wears, the control arm shifts position, letting alignment settings drift and dulling the car's steering precision over time. SuperPro's SPF3507XK addresses this with a double-offset polyurethane design that both replaces the worn bushing and adds deliberate positive caster to the front suspension geometry.

That extra caster sharpens turn-in feel and improves how readily the steering wheel returns to center after a corner, all without the accelerated tire wear that comes from a camber-only alignment change. This is a popular upgrade among IS250, IS350, IS F, GS300, and GS350 owners on RWD platforms looking to correct sagging alignment or simply dial in sharper handling than stock.

Because this kit changes suspension geometry rather than just swapping a worn part, a front wheel alignment is required afterward to properly set the new caster alongside camber and toe. It's worth double-checking your drivetrain before ordering - this bushing is built specifically for RWD models and is not intended for the AWD variants of these same Lexus platforms.